JP2009166968A - Powder and grain delivery device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reliably deliver powder and grain while preventing the occurrence of a bridge phenomenon in a hopper. <P>SOLUTION: This powder and grain delivery device uses a screw feeder 3 for delivering powder and grain on a predetermined amount basis from the hopper 2 reserving the powder and grain. The screw feeder 3 to be traversed perpendicularly to the axial direction is provided on an inner bottom portion of the hopper 2. The screw feeder 3 has a traverse mechanism 4 for traversing it. In the bottom portion of the hopper 2, a powder and grain discharge port 31 is formed along the traversing direction of the screw feeder 3 for dropping the powder and grain carried to a front end 3a of the screw feeder 3 in the carrying direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a granular material dispensing apparatus for dispensing a granular material by a predetermined amount by a screw feeder from a hopper storing granular materials such as cement raw material and fuel.

Powder particles such as cement raw material and fuel are stored in a hopper and supplied as raw material or fuel while being dispensed in a necessary amount. As such a granular material dispensing device, for example, as disclosed in Patent Document 1, a screw feeder is provided at the bottom of the hopper, and the granular material stored in the hopper is quantified from the bottom of the hopper by the screw feeder. There are things that are paid out one by one.
Japanese Patent Laid-Open No. 10-236580

  By the way, when handling high moisture content powder or lump sand as a granular material, it is hardened in the hopper by containing moisture and adheres to the so-called “shelf” bridge phenomenon or the inner wall surface of the hopper. The “living” phenomenon occurs, and the problem that it is difficult to drop from the hopper is likely to occur. Generally, when powder particles solidify in the hopper and stop falling, the hopper walls and screw feeder are vibrated to break up the powder particles in the hopper. In this case, it is difficult to drop it only to the extent that vibration or the like is applied. In particular, as the size of the hopper increases, a larger gravity acts on the bottom of the hopper, and the powder particles at the bottom of the hopper are pressed and hardened by the gravity.

  This invention is made | formed in view of such a situation, and it aims at preventing generation | occurrence | production of the bridge phenomenon etc. in a hopper, and paying out a granular material reliably.

  The granular material dispensing apparatus according to the present invention is a granular material dispensing apparatus that dispenses a predetermined amount of powder by a screw feeder from a hopper in which the granular material is stored, wherein the screw feeder is an inner bottom portion of the hopper. The screw feeder is provided with a traverse mechanism for laterally moving the screw feeder. The bottom of the hopper is conveyed to the front end in the conveying direction of the screw feeder. The granular material discharge port for dropping the granular material is formed along the lateral movement direction of the screw feeder.

  That is, the screw feeder is configured to send out powder particles between the spirals of the blades of the screw in the axial direction by rotating around its axis, and the screw feeder is provided at the inner bottom portion of the hopper. As a result, it is provided so as to be buried in the granular material, and when the screw feeder is driven to rotate, the granular material in the hopper is sent to the front end portion while being sequentially scraped from below by the blades of the screw feeder. In this case, since the screw feeder can be moved laterally by the traverse mechanism, it can be discharged while scraping the powder particles at each part in the hopper by moving laterally as necessary. It is possible to prevent the occurrence of a bridging phenomenon in which powder particles are clogged in the middle and do not fall.

  Further, in the powder particle dispensing apparatus according to the present invention, the rotational drive unit of the screw feeder and the lateral feed drive unit of the traverse mechanism each have a speed control unit capable of changing the drive speed. And

  In the payout device, the speed control unit can change the rotational drive speed and the lateral feed speed of the screw feeder, so that the payout amount and the like can be appropriately adjusted by controlling the speed.

  In addition, in the powder particle dispensing apparatus according to the present invention, a discharge amount measuring device for measuring the amount of the powder discharged from the particle discharge port is provided, and the discharge amount measuring device includes the discharge amount measuring device. A payout amount control unit for controlling the driving speed of the rotation driving unit of the screw feeder based on the measurement result of the amount is connected.

  Further, in the powder particle dispensing device according to the present invention, a load detector for detecting the load of the screw feeder is provided, and the load detector is provided with a lateral feed drive unit of the traverse mechanism based on the detection result of the load. A transverse feed control unit for controlling the driving speed is connected.

  Furthermore, in the granular material dispensing apparatus according to the present invention, the front wall of the hopper in the vicinity of the front end portion of the screw feeder is inclined in a direction of gradually expanding the granular material storage space in the hopper as it goes downward from above. It is characterized by that. In other words, since the hopper is shaped to spread downward by the inclined front wall, the occurrence of a bridging phenomenon in the middle is suppressed.

  In the powder particle dispensing device according to the present invention, a cover that covers the upper side of the lateral movement space at the front end of the screw feeder is provided at the bottom of the hopper. At the front end of this screw feeder, the powder particles scraped off by the screw feeder are discharged from the front end, and the upper part is covered with a cover to regulate the flow of the powder from above. Since the movement of the granular material can be restricted in the axial direction of the screw feeder, inadvertent dropping from the horizontally long granular material discharge port can be prevented.

  Further, in the granular material dispensing apparatus according to the present invention, a feeder evacuation chamber capable of retracting and storing the screw feeder laterally from the granular material storage space in the hopper is formed in a side portion of the hopper. The lid is provided so as to be openable and closable above the feeder retracting chamber. If the screw feeder arranged so as to be buried in the granular material in the hopper is moved to the feeder retracting chamber, the lid of the feeder retracting chamber can be opened to perform operations such as maintenance.

  According to the granular material dispensing apparatus according to the present invention, a screw feeder is provided so as to be buried in the granular material in the hopper, and the powder particles are sequentially scraped from below by the blades and sent to the front end, In that case, the powder feeder can be scraped off and discharged at each part in the hopper while the screw feeder moves laterally, and this causes the occurrence of a bridge phenomenon that prevents the powder from clogging and dropping in the middle of the hopper Can be prevented.

  Hereinafter, an embodiment of a powder particle dispensing apparatus according to the present invention will be described with reference to the drawings.

  In the dispensing device according to the present embodiment, a hopper 2 for storing cement raw materials, fuel particles and the like is fixed to a gantry 1, and a screw feeder 3 can be moved laterally by a traverse mechanism 4 at the inner bottom of the hopper 2. A conveyor 5 is provided for receiving and transferring powder particles scraped from the hopper 2 by the screw feeder 3, and a controller 6 for controlling the driving of the screw feeder 3 is provided. ing.

  As shown in FIGS. 2 and 3, the hopper 2 has a horizontally long rectangular shape having a bottom plate 11, a side wall 12, a front wall 13, a rear wall 14, and the like. In the illustrated example, four lids 16 formed and opened and closed for opening and closing the granular material inlet 15 are provided side by side in the left-right direction so that they can be opened and closed one by one. Further, the front wall 13 of the hopper 2 is provided so as to be inclined in a direction in which the granular material storage space 2a in the hopper 2 is gradually expanded from the uppermost granular material inlet 15 toward the lower side. A cover 17 is horizontally provided at the lower end of the front wall 13 so that the front end portion 3a of the screw feeder 3 can be accommodated between the bottom plate 11 and the cover 17 has a slight height at the front end. The vertical wall 18 is provided.

  The screw feeder 3 is disposed on the bottom plate 11 of the hopper 2, and a front end portion 3 a penetrates the vertical wall 18 of the hopper 2 and a rear end portion penetrates the rear wall 14 of the hopper 2. The through portions in the vertical wall 18 and the rear wall 14 of these hoppers 2 are horizontally long through holes 19 formed over almost the entire width of these walls. And the edge part of the screw feeder 3 which protrudes from this through-hole 19 is rotatably supported by the bearing member 23 fixed to the traveling carts 21 and 22, respectively. The rails 24 that support the traveling carriages 21 and 22 are fixed to the gantry 1 along the horizontal direction at the front and rear positions of the hopper 2.

  Further, of the traveling carriages 21 and 22, the traveling carriage 21 disposed at the front position of the hopper 2 includes a rotational drive unit 25 that rotates the screw feeder 3 and the traveling carriage 21 that runs horizontally along the rail 24. A traveling drive unit 26 is provided. Then, the traveling carriage 21 is horizontally moved by the traveling drive unit 26, so that the screw feeder 3 supported by the bearing member 23 of the traveling carriage 21 is laterally moved in the horizontal direction perpendicular to the axis. It has become. That is, the travel carts 21 and 22 and the travel drive unit 26 constitute the traverse mechanism 4 of the screw feeder 3, and the travel drive unit 26 in this case is a lateral feed drive unit for the screw feeder 3. .

  Further, the front end portion of the bottom plate 11 of the hopper 2 is separated from the vertical wall 18, and a powder discharge port 31 is formed between the bottom plate 11 and the vertical wall 18. A front end 3a of the screw feeder 3 is disposed above. Since the front end portion 3a of the screw feeder 3 moves in the horizontal direction, the granular material discharge port 31 is formed to be long in the horizontal direction so as to cover the entire length of the movement locus, and has a cylindrical hood directed downward. 32.

  Further, as shown in FIGS. 1 and 2, one side wall of the both side walls 12 of the hopper 2 projects in the vicinity of the bottom in the horizontal direction, and the vertical wall 18 so as to form front and rear walls thereof. A part of the rear wall 14 is also overhanging, and a feeder retracting chamber 33 is formed on the side of the granular material storage space 16. The through holes 19 in the vertical wall 18 and the rear wall 14 are also formed to extend to the feeder retracting chamber 33. Therefore, the screw feeder 3 in the hopper 2 is laterally fed until it is stored in the feeder retracting chamber 33. In addition, a lid body 34 that opens and closes above the feeder retracting chamber 33 is provided.

  On the other hand, as shown in FIG. 3, the control unit 6 includes a feeder rotational speed control unit 41 that controls the rotational speed of the screw feeder 3 and a traveling speed control unit 42 that controls the moving speed of the traveling carriage 21. The speed control units 41 and 42 can appropriately adjust the payout amount from the screw feeder 3 and the like.

  Further, a payout amount measuring device 43 that measures the amount of the powder discharged from the powder discharge port 31 is provided in the vicinity of the powder discharge port 31 of the hopper 2. Is output to the feeder rotation speed control unit 41. The rotational speed of the screw feeder 3 is controlled based on the measurement result, and the feeder rotational speed control unit 41 drives the rotational speed of the rotational drive unit 25 of the screw feeder 3 based on the measurement result of the payout amount. A payout amount control unit that performs feedback control is configured.

  On the other hand, the rotation drive unit 25 of the screw feeder 3 is provided with a load detector 44 that detects a load applied to the screw feeder 3 from the drive current value and the like, and the detection signal is input to the travel speed control unit 42. It has become so. The moving speed of the traveling carriage 21 is controlled based on the detection result of the load detector, and the traveling speed control unit 42 is configured to control the traverse mechanism 4 based on the detection result of the load on the screw feeder 3. A transverse feed control unit that controls the driving speed of the transverse feed drive unit 26 is configured.

  In addition, the conveyor 5 which transfers the granular material paid out from the screw feeder 3 receives the granular material from the hopper 2 and sends it from the front position to the side, and the delivery conveyor 45 delivers the granular material. It is set as the structure provided with the conveyance conveyor 46 which conveys the granular material to the target position. And the receiving conveyor 45 is provided along the length direction of this granular material discharge port 31 just under the granular material discharge port 31, as shown in FIG.1 and FIG.3. In FIG. 1, reference numeral 47 denotes a worker's scaffold provided on the gantry 1.

  In the dispensing device configured as described above, when the granular material P stored in the hopper 2 is to be dispensed, the screw feeder 3 is rotated by the rotation drive unit 25 of the screw feeder 3, so that the screw feeder 3 The granular material P collected between the spiral blades 3b is sent to the front end portion 3a of the screw feeder 3, and is received on the receiving conveyor 45 from the granular material discharge port 31 formed below the front end portion 3a. Can be dropped.

  In this case, since the screw feeder 3 is disposed so as to be buried in the inner bottom portion of the hopper 2, that is, in the granular material storage space 2 a in the hopper 2, the blade 3 b of the screw feeder 3 is the granular material P. As shown by the arrow X in FIG. 3, it can be sent out by scraping from the bottom sequentially, and the powder P constantly flows down from above between the blades 3b.

  Moreover, in the granular material storage space 2a in the hopper 2, a phenomenon occurs in which the granular material P in the upper position of the screw feeder 3 is pushed forward due to the scraping action of the blade 3b of the screw feeder 3. Since the front wall 13 of the hopper 2 is inclined so as to gradually widen the granular material storage space 2a from the upper side toward the lower side, the internal granular material P is indicated by an arrow Y in FIG. Therefore, it can be slid down along the front wall 13, so that it can be prevented from being compressed in the vicinity of the front wall 13, and the occurrence of the bridge phenomenon can be prevented.

  Then, by feeding the screw feeder 3 laterally, the powder body P can be discharged while being scraped over the entire hopper 2. When the load detected by the load detector 44 increases during the lateral feeding of the screw feeder 3, the traveling carriages 21 and 22 are stopped, and the same position is maintained until the load falls below a predetermined value. Dispose of the powder. This is a case where a large amount of powder is accumulated at a high load position as shown in FIG. 4A, or when the scraping resistance is large due to the high moisture content of the powder. Therefore, the work of scraping the granular material is continued until the load is reduced. When the load is reduced, the powder particles at that position are reduced as shown in FIG. 4B, so that the position of the screw feeder 3 is moved laterally.

  Further, when it is detected from the measurement result of the payout amount measuring device 43 that the payout amount has decreased, the rotational drive unit 25 performs control to increase the rotational speed of the screw feeder 3, and conversely the payout amount increases. When it is detected that the rotation speed of the screw feeder 3 has been detected, control is performed to reduce the rotational speed of the screw feeder 3, and a substantially constant amount of payout is maintained by these controls. Then, the discharged granular material is transferred from the receiving conveyor 45 to the conveying conveyor 46 and is conveyed to the target position.

  When the total amount of the powder particles in the hopper 2 is reduced, a new powder particle is charged from the powder particle inlet 15, and at that time, a plurality of lids 16 are appropriately selected into the hopper 2. The powder is evenly charged. When cleaning the screw feeder 3 or the like, the screw feeder 3 can be moved to the feeder retracting chamber 33 and the lid 34 can be opened to perform a cleaning operation or the like.

  In addition, this invention is not limited to the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.

  For example, in the embodiment, one screw feeder is used, but a plurality of screw feeders may be provided and laterally fed individually. Also, a fin-like cover made of an elastic material such as rubber is attached to the through-hole 19 of the hopper 2 that penetrates both ends of the screw feeder 3, and the through-hole 19 is normally closed by the cover, and the cover is deformed. It is good also as a structure to which the screw feeder 3 moves sideways, making it do.

It is a top view which shows one Embodiment of the discharge apparatus of the granular material which concerns on this invention. It is a front view of the payout apparatus of FIG. It is sectional drawing which follows the AA line of FIG. It is the model which showed the relationship between the quantity of the granular material in a hopper, and the lateral feed of a screw feeder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stand 2 Hopper 2a Granules storage space 3 Screw feeder 3a Front end 3b Blade 4 Traverse mechanism 5 Conveyor 6 Control unit 11 Bottom plate 12 Side wall 13 Front wall 14 Rear wall 15 Granule inlet 16 Cover 17 Cover 18 Vertical wall 19 Through-holes 21 and 22 Traveling carriage 23 Bearing member 24 Rail 25 Rotation drive part 26 Travel drive part (transverse drive part)
31 Powder body discharge port 32 Hood 33 Feeder evacuation chamber 34 Cover body 41 Feeder rotation speed control section (payout amount control section)
42 Traveling speed controller (transverse feed controller)
43 Discharge amount measuring device 44 Load detector 45 Receiving conveyor 46 Conveying conveyor 47 Scaffolding

Claims (7)

In the discharging apparatus for the granular material that discharges the granular material by a predetermined amount by a screw feeder from a hopper in which the granular material is stored,
The screw feeder is provided at the inner bottom portion of the hopper so as to be movable in a lateral direction perpendicular to the axial direction, and the screw feeder is provided with a traverse mechanism for moving the screw laterally. 2. A granular material dispensing device, wherein a granular material discharge port for dropping granular material conveyed to a front end portion in a conveying direction of a feeder is formed along a lateral movement direction of a screw feeder.   2. The powder particle dispensing apparatus according to claim 1, wherein each of the rotational drive unit of the screw feeder and the lateral feed drive unit of the traverse mechanism has a speed control unit capable of changing a drive speed.   A payout amount measuring device for measuring the amount of the powder discharged from the powder discharge port is provided, and the payout amount measuring device includes a rotation drive unit of the screw feeder based on the result of the payout amount measurement. 3. A powder particle dispensing apparatus according to claim 1, further comprising a dispensing amount control unit for controlling a driving speed.   A load detector for detecting the load of the screw feeder is provided, and a lateral feed control unit for controlling the driving speed of the lateral feed drive unit of the traverse mechanism based on the load detection result is connected to the load detector. The discharge device for a granular material according to any one of claims 1 to 3, wherein:   The front wall of the hopper in the vicinity of the front end portion of the screw feeder is inclined in a direction of gradually expanding the granular material storage space in the hopper as it goes downward from above. The granular material dispensing device according to any one of the preceding claims.   6. The discharge of the granular material according to claim 1, wherein a cover that covers an upper side of a lateral movement space at a front end portion of the screw feeder is provided at a bottom portion of the hopper. apparatus. A feeder evacuation chamber capable of retracting and storing the screw feeder laterally from the granular material storage space in the hopper is formed at a side portion of the hopper, and a lid body that can be opened and closed above the feeder evacuation chamber. It is provided, The discharging apparatus of the granular material as described in any one of Claim 1 to 6 characterized by the above-mentioned.

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